“…There are a variety of electrical and electromagnetic geophysical methods that may be applied for the subsurface examination of river dikes, such as electrical resistivity tomography (ERT), electromagnetic profiling (EMP), ground penetrating radar (GPR) and occasionally capacitively-coupled resistivity method [2,9,10,11,12,16,18,23,24,25,29,36]. Increasingly, the seismic technique known as multichannel analysis of surface waves (the MASW technique) is also applied to study river dikes [20,27,28].…”